Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd892c66430f2b50…

MALICIOUS

PDF

5.2 KB
MD5: ea7a38064b346800540b63209c14baf7 SHA-1: 0958535e6fdd260f2166061e4a361e1e2a7204d8 SHA-256: bd892c66430f2b508a2786eafe240bc04ad11e4723ad67150dd6a26426d0f944
144 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by multiple detection engines, including ClamAV which identified it as 'Pdf.Exploit.Agent-36178'. Static analysis revealed embedded JavaScript, the use of ASCIIHexDecode and ASCII85Decode filters, and String.fromCharCode, all indicative of obfuscation techniques commonly used to hide malicious code. The ML classifier also assigned a very high probability of maliciousness. The primary attack vector appears to be exploiting a PDF vulnerability to execute arbitrary code via JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • ClamAV: Pdf.Exploit.Agent-36178 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36178
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

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